Grate-bar.



G. E. CAMP.

GRA AR. APPLiOATION 1" AUG. 14, 1912. 1,089,317, Patented Mar.3, 1914.

Fig-Z).

WITNESSES: v INVENTOR W M W ATTORNEYS COLUMBIA PLANOGRAPH c0., WAS c.

GEORGE E. CAMP, OF UTICA, NEW YORK, ASSIGNOR T0 INTERNATIONAL COMPANY, OF NEW YORK, N. Y.,

HEATEE A CORPORATION OF NEW YORK.

GRATE-BAR.

inseam To all whom it may concern:

Be it known that I, GEORGE E. CAMP, of Utica, in the county of Oneida and State of New York, have invented certain new and useful Improvements in Grate-Bars; and I do hereby declare that the following is a full clear and exact description thereof, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the reference-numerals marked thereon, which form part of this specification.

The purpose of my present invention is to provide a revolving grate bar of improved construction adapted to be used generally in heaters, boilers and furnaces.

One object of my invention is to provide a grate bar of this class that shall be symmetrical in form to the end that there may be an economical consumption of fuel by reason of the grate being provided with a sufficient area of air supply in proportion to the area of the grate and especially so that there will be no variation in the proportion or form of air supply when the grate bar is rotated to bring another face into action as the fuel-supporting surface.

A further object is to provide a rotating grate bar having its projecting leaves so constructed and arranged that whichever side is used as a fuel-supporting surface it can be cleaned by the ordinary slice bar with equal facility without the slice bar being able to drop into the space between the leaves.

A still further object is to combine in one grate bar the advantages of these two fea tures, namely that no matter which side of the grate bar is used there will be the same proportion of air supply and an equal opportunity to readily use the slice bar.

A further object is to provide a rotating grate bar with the leaves projecting therefrom in such a manner that rotation or partial rotation of the grate bar tends to move the fuel resting thereupon lengthwise of the grate bar. Rotation of the ordinary grate bar moves the supported fuel up and down and allows it to move or slide at right an gles to the length of the grate bar. My improvement retains both of these movements and adds thereto a movement lengthwise o" the grate bar and thereby obtains a more thorough and efficient agitation or obtains Specification of Letters Patent.

Application filed August 14, 1912.

Patented Mar, 3 1214..

Serial No. 714,956.

the necessary sifting out of the ashes with less movement and with less disturbance of the fire and less loss of fuel.

A further object is to construct a rotating grate bar so that this lengthwise movement may be obtained no matter which side of the bar is being used as the fuel-supporting surface and further to so balance the means whereby this endwise motion is obtained that the fuel will not be forced to one end of the bar but will have a back and forth movement longitudinally of the bar which will result in the fuel being returned to about its original position.

Figure 1 is a plan or top view of grate bar embodying my invention with a portion of a slice bar resting thereupon. Fig. 2 is a side elevation of the grate bar and slice bar shown in Fig. 1. Fig. 3 is a perpendicular cross sectional view taken on line 33 of Fig. 2. Fig. is a perpendicular cross sectional view taken on line 1% of Fig. 2. Fig. 5 is a longitudinal sectional view taken on lines 567, 8-ll-9, or 10-6--11 with the parts numbered according to the first indicated section. 6 is a longitudinal sectional view on line 9-6--7, 116--7, or

1169 with the parts numbered accord.

ing to the first indicated. sectional line.

The shaft 12 of my grate bar is preferably shaped so as to be in cross section an equilateral triangle resulting in the shaft having three faces 18, 1a and 15. Upon the ends of the grate bar are provided journa portions 16 and 17 rotating in bearings 18 and 19 respectively provided in the grate frame.

At intervals along the shaft 12 there are provided integral therewith projecting triangular shaped wings arranged in series of three surrounding the shaft 12 as by having wings 20, 21 and 22 project respectively from faces 13, 1 1 and 15 respectively of the shaft, Each wing has two outer faces and 24 arranged at an angle to each other and the triangular wings are of the size of the shaft 12 so that these faces 23 and 2 1 of adjacent wings are in a straight line across the apex or corner of triangular shaft 12 and adapted to be a fuel-supporting surface of the grate bar. In other words the triangular shaft 12 is in the relation of being inscribed within the three f11el-si1p 2orti.11g surfaces of the grate bar. As they extend from the shaft 12 the projecting wings all tad J slant toward one end of the grate bar as toward the journal 16 as illustrated in the drawings so that one side 25 of each wing is undercut or at less than an angle of 90 with regard to its face of the shaft while the other side of each wing is at an angle of more than 90 with regard to the same face of the shaft 12.

It will now be evident that each of the three sides of the grate bar is adapted to be used as a fuel-supporting surface and that they are similar in size, shape and construction. The fuel-supporting surface from each series of wings consists of one outer 5 surface from two adjacent wings while the other four outer surfaces of that series of .wings are underneath or not acting as fuelsupporting surfaces. The wing faces upon each side of the grate bar come together at the center at an angle to each other by reason of the slant of all the wings toward one end of the grate bar as particularly shown in Fig. 1. Also along this center the shaft 12 comes to a sharp edge at the fuel-supporting line by reason of the meeting of two of its faces 13, 14 or 15 but af fords practically no fuel-support by reason of the sharp downward slope of said surfaces and therefore substantially all the space from the outer faces of one set of wings to the adjacent set is available as air supply. The extent to which the side 2 f the wings project into this space as seen in Fig. l is compensated for by a similar amount of undercut in the opposing side of the adjacent wing and therefore the actual air supplying space is not diminished.

W hen it is desired to clean off the fuelsupporting surface of a grate bar of my construction by means of a slice bar having a long blade 27 with handle 28 for manual operation it will be obvious from Figs. 1 and 2 that the blade 27 cannot drop into the spaces between the wings because the point of the projecting angle formed by the wing faces 23 and 24: project toward the reentering angle formed by the preceding faces 23 and 2a sufliciently to support the slice bar as it passes from one set of wings to the next. I am aware that this angular shape of each fuel-supporting member has been used heretofore in the single fuel support ing surface of a stationary grate bar but I am not aware that a grate bar has ever been made before having such an angular shape for the different fuel-supporting surfaces of a rotating grate bar. It will be obvious to anyone skilled in the art of casting that it would be impossible with ordinary methods to withdraw fl om the mold a pattern having these three rows of divergingly extending wings. the other hand unless the three fuel-supporting surfaces of a grate bar were constructed of similar shape the slice bar would not operate in the same way upon the different faces nor would the air supply be similar. It is well known that in revolving grate bars it is highly desirable to have the three fuel-supporting surfaces of similar shape so that the air supply and consequent fuel consumption will not vary the grate bar is revolved from one face to another.

When the ordinary triangular grate bar is rotated it is obvious that it imparts an up and down motion to the fuel and also that it permits a sliding of the fuel crosswise of the grate bar as the fuel-supporting surface is inclined one way or the other. To these two agitating motions l have added a third motion by having the wings of my grate bar project slantingly from the shaft. It will be obvious that as a lump of fuel 29 rests against these slating ec es rotation of the grate bar will force it lon gitudinally of the grate bar as the lump of fuel slides along the inclined fuel-supporting surface from the position shown in the solid lines in Fig. 1 to that shown in dotted lines at 29 and then in the opposite longitudinal direction as it engages the oppositely slanting edges of the wings on the other side of the grate bar and passes back to the position indicated in dotted lines at 29. This third or enclwise motion imparted to the ashes or fuel results in great efficiency of the grate bar in that it subjects the ashes or fuel to motion in every direction and so gives every opportunity for shaking out ashes or dislodging clinkers and so clears the fire by less violent movement than is otherwise necessary. It will be further noticed that by having all the wings slant in one direction and so produce an angle between the two active wings of each set the back and forth movement of the fuel longitudinally of the grate bar is balanced so that the fuel is not unduly forced to one side of the grate but is practically returned to the same place.

hat I claim as new and desire to secure by Letters Patent is:

1. In a revolving grate bar a shaft triangular in cross section, journals on said shaft, triangular wings projecting from the surfaces of said shaft and all slanting toward the same end of said shaft and having their outer faces each adapted to form substantially flat fuel-supporting surfaces.

2. In a revolving grate bar a shaft, journals on said shaft, wings projecting from said shaft in series of three extending about said shaft and all slanting toward the same end of said shaft, said wings having their outer faces at an angle to each other and each of said faces forming with the adja cent face of another wing of the same series a substantially fiat fuel-supporting surface.

3. In a revolving grate bar a shaft triangular in cross section, journals on said In Witness whereof I have affixed my sigshaft, triangular Wings projecting from said nature, in the presence of two Witnesses, 10 shaft in series of three extending about said this 7th day of August 1912.

shaft and all slantin toward the same end of said shaft, each of th'e outer faces of said GEORGE CAMP Wings forming With the adjacent face of Witnesses: another Wing of the same series a substan- IIARRIET WILLIAMs, tially fiat fuel-supporting surface. S. E. 'HooKs.

fiopiel 0t thil patent may be obtained for live cents each, by addressing the Gomminioner of Patents,

Washington, D. G. 

